500 watts @ 4 ohms per channel is what each of the models is offering you. If you are working with demanding subs you can simply bridge each channel pair and get 1000 watts @ 8 ohms.
A real benefit for your rental and touring business: all members of the MCD series are lightweights, thanks to class D architecture and efficient switch mode power supplies. In addition you can
save money with the automatic standby function, which reduces the power consumption while you do not use the amp.